Detail of three fired copper bullets, about 2002, XX.5661, XX.5662, XX.5663. Royal Armouries, CC BY 4.0
Three fired copper bullets (XX.5661, XX.5662, XX.5663)
These three bullets, made by the American company Barnes Bullets in 2002, are 'test' ammunition. They were fired into water tanks to examine their ballistic characteristics, to see how they would work in the real world.